1. CERN IT Department CH-1211 Geneva 23 Switzerland www.cern.ch/i t A proposal for improving Job Reliability Monitoring GDB 2 nd April 2008

2. CERN IT Department CH-1211 Genève 23 Switzerland www.cern.ch/i t Internet Services Problem Statement We would like to be able to gather job state transitions from all jobs submitted in WLCG resources –EGEE RB + WMS submitted jobs Jobs submitted directly to a CE (via condor_g) –OSG Jobs on a OSG CE for WLCG VOs –Nordugrid ARC CE Use this to calculate resource reliability –And use for debugging e.g. Dashboards 2

3. CERN IT Department CH-1211 Genève 23 Switzerland www.cern.ch/i t Internet Services Principles Only gather this information once –Propagate to interested parties Using existing systems and expertise where possible –Don’t try and deploy components on every WMS/RB/L&B/CE/… –Get ‘cooked’ data from the systems Hook up with Pilot Jobs –Linkage between pilot and experiment jobs as a ‘state change’ ‘Job Wrapper tests’ fit in here too –They’re just another state change 3

4. CERN IT Department CH-1211 Genève 23 Switzerland www.cern.ch/i t Internet Services Current situation - Gridview Currently mines L&B log files, and sends them via R-GMA Loses many records Hacks to ‘finish’ unfinished jobs after 24 hours –Inaccurate results 4

5. CERN IT Department CH-1211 Genève 23 Switzerland www.cern.ch/i t Internet Services Current situation - Dashboard Jobs reported via experiment frameworks –Gathers from many sources – Imperial College XML files, job submission tools, monAlisa reporting from jobs, R-GMA But some missing information for condor_g jobs –info between submission and user job starting on WN –Job aborted Some work done (Sergey Belov/Dubna) on reporting state changes inside condor_g Presentation title - 5

6. CERN IT Department CH-1211 Genève 23 Switzerland www.cern.ch/i t Internet Services Proposal Use WLCG Monitoring infrastructure (MSG) for collecting and transporting the data –Messaging system –Standard message formats Work with expert groups to instrument the job submission systems Visualization by Gridview + Dashboards 6

7. CERN IT Department CH-1211 Genève 23 Switzerland www.cern.ch/i t Internet Services Effort Provide some effort to do the instrumentation –Coordination – WLCG Monitoring (D Rodrigues) –Messaging system integration - Gridview –EGEE WMS – L&B, Gridview –Condor-G – Condor team, Dashboard team –OSG CE – through OSG participation in the Joint Monitoring Group (OSG Operations (Rob Quick), measurements & metrics (Brian Bockelman) Presentation title - 7

8. CERN IT Department CH-1211 Genève 23 Switzerland www.cern.ch/i t Internet Services EGEE L&B Notifications means we don’t have to run components mining L&B logfiles –Consumer of notifications can be remote L&B is stated to scale for our needs –Tested at >1m records/day –Testing of integrating with notifications underway by gridview team Message formats already defined –Old log mining approach will all be moved to messaging system to free GridView from R-GMA dependency 8

9. CERN IT Department CH-1211 Genève 23 Switzerland www.cern.ch/i t Internet Services condor_g condor_g submitter instrumented to create L&B messages –Done by a separate listener process that is started by condor_g –Limited subset of condor_g state changes will be sent Listener/reporter can use different transport for reporting –Currently monalisa as a transport layer –Will migrate to WLCG messaging system 9

10. CERN IT Department CH-1211 Genève 23 Switzerland www.cern.ch/i t Internet Services EGEE Architecture 10

11. CERN IT Department CH-1211 Genève 23 Switzerland www.cern.ch/i t Internet Services OSG Gratia is used to transport messages inside OSG A Gratia-MSG Bridge could be implemented –Similar to the RSV bridge used for OSG availability Plan to include discussion in the upcoming EGEE-OSG-WLCG design meeting in Madison at the end of May –Hope to further collaborate with OSG on the infrastructure for the analysis of the collected data, dashboards etc. 11

12. CERN IT Department CH-1211 Genève 23 Switzerland www.cern.ch/i t Internet Services Nordugrid –Currently only Nordugrid Job info is via ATLAS production DB –How do we get information from the CE? Will look to implement a similar bridge if needed –Need to work through the technical details with the experts –Discussion yet to start… Presentation title - 12

13. CERN IT Department CH-1211 Genève 23 Switzerland www.cern.ch/i t Internet Services Pilot Jobs L&B client resides on every worker node Can be used to submit additional messages to L&B for a job –Timestamps +environment for Job Wrapper start/end –Timestamp of handover to user job –Linkage of pilot job to experiment job ID –… Benefit is that it’s all in one coherent data structure for a given job 13

14. CERN IT Department CH-1211 Genève 23 Switzerland www.cern.ch/i t Internet Services Summary Propose a more coherent approach to mining job state changes –Uses expert knowledge where possible to ‘cook’ the data into a useful structure Fits the principles of the WLCG monitoring activity –Use common message system components –Split the work across the relevant teams What have we missed? –Your feedback essential… 14